Positioning device for pin stem finding



June 28, 1955 J. R. WATSON 1 POSITIONING DEVICE FOR PIN STEM FINDINGFiled Jan. 7, 1954 IN V EN TOR.

JOHN R. WATSON ATTORNEYS United States Patent 2,711,569 POSITIONINGDEVICE FOR PIN STEM FINDING John R. Watson, Bristol, R. I., assignor toB. A. Ballot] & Co., Incorporated, a corporation of Rhode IslandApplication January 7, 1954, Serial No. 402,781

1 Claim. (Cl. 22-116) This invention relates to the forming of anarticle of jewelry with a pin stem finding thereon.

A number of articles of jewelry are cast by the flowing of metal into amold and thereafter a pin stem joint and pin stem catch are attachedthereto. More recently there has been developed a pin stem finding suchas a catch or a joint which has a portion extending from its base sothat it may be embedded in the article of jewelry as the article ofjewelry is cast or molded. This pin stem finding in such cases is heldin position and the article to be formed cast about a portion of thebase of this pin stem finding. Some ditficulty has been experienced inpositioning and holding the pin stem finding in the correct relation tothe article of jewelry.

One of the objects of this invention is to provide a means and a methodof holding the pin stem finding in position at the time that the articleof jewelry is cast about the base portion thereof.

Another object of the invention is to provide a clip which may be of thecorrect dimensions to co-operate with the pin stem finding and which maybe removably positioned in a recess in the mold for accommodating thepin stem finding and which will hold the finding in position.

With these and other objects in view, the invention consists of certainnovel features of construction as will be more fully described andparticularly pointed out in the appended claim.

In the accompanying drawings:

Figure 1 is a perspective view of a block which forms a part of the moldin which block there is a recess to receive the pin stem finding, inthis case a safety catch, and into which recess the pin stem finding isshown as positioned, the article to be cast about it being shown indotted lines with the remainder of the mold removed; Figure 2 is asectional view longitudinally of the bar shown in dotted lines in Figure1;

Figure 3 is a sectional view on line 3-3 of Figure 1 showing therelation of the parts;

Figure 4 is a perspective view of the holding device of Figures l-3which is inserted in the recess which receives the pin stem finding;

Figure 5 is a sectional view showing a pin stem finding which in thiscase is a joint in position in a recess with a modified form of holdingmeans therein;

Figure 6 is a sectional view on line 66 of Figure 5; and

Figure 7 is a perspective view of the holding device used in Figures 5and 6.

A pin stem of the type mounted upon an article of jewelry, a badge, orthe like is hingedly mounted in a joint at one end, while the other endis received in a catch which holds the pin stem in secured positionafter being passed through the garment of the wearer. These pin stemfindings consisting of the catch and the joint are provided with anchorportions at their base which may be imbedded in or the article to whichthey are attached to be cast about this anchor extension from the base.

In each case the slot in which the pin stem operates is provided in thefinding. In the joint there is additionally at least one flat surfacewhere the hole is formed for the pivot trunnions which have bearing inthe body, and l utilize this flat surface, which in the present instanceintersects a spherical body, for holding the pin stem finding in thedesired position which it is to assume in order that the pin stem andjoint may properly function, it being known that a certain relativeposition of these parts must be maintained in order that the pin stemmay swing on its joint and have the desired relation with the catch. Ihave formed a positioning device which consists of a spring clip whichmay be received in a cylindrical recess and which will have a portionextending therefrom to provide a wall of the recess so as to engage thefiat surface in a plane intersecting the body of the finding and holdthe finding in desired position.

With reference to the drawings, Figures 1-4 are directed to the findingas a catch for the pin stem, while Figures 5, 6 and 7 are directed to apin stem joint.

In Figure 1, 10 designates a block which is a portion of the moldpresenting the mold surface 11 which forms one of the surfaces of thefinished articles to be cast and which is designated as 12 and shown indotted lines in Figure 1. This solid block 10 is provided with acylindrical recess 14 as shown in Figures 2 and 3 which is of a size toreceive the pin stem finding which in this case is shown as a safetycatch 15. This safety catch has a spherical body portion 16 slotted asat 17 to receive the rotor 18 and which is formed with a flat surface 19formed by boring through this side of the catch for providing thebearing in which the trunnions of the rotor 18 revolve. The body isflanged at its base portion as at 20 to present an annular surface 21 ina single plane for supporting the finding upon the article 12 with whichit is to be assembled. An anchor portion 22 extends beyond this planeand below the spherical body 16 to be imbedded in the cast article 12.This cylindrical recess 14 is of a diameter substantially the diameterof the spherical body 16 as may be better seen in Figure 3.

In order to hold this safety catch in the position desired, I provide aclip 23 shown in perspective in Figure 4, which has an arcuate portion24 of a size which when uncompressed is slightly larger than thecylindrical surface of the recess 14 but which may be slightlycompressed so as to be slid along this cylindrical surface 14 and by itsoutward expansion frictionally grip the same along the arcuate portion24. A wall 25 extends from the arcuate portion 24 and in the presentcase axially of the axis of the arcuate portions and provides a flatsurface 26 which will engage the flat surface 19 of the body 16 to holdthe finding, or catch in this case, from turning in the recess. There issufficient grip of the arcuate portion 24 with the side walls of therecess so that the clip will itself not be twisted in the recess. Thisalso assures that when the finding is placed in position, it will bepositioned as desired with reference to the mold in which the article 12is to be cast. The length of the wall 24 also may be utilized forlimiting the insertion of the finding into the recess by reason of itsend portion 27 engaging the flange 20 of the finding.

A similar scheme of operation is provided with the finding in the formof a pin stem joint. In this case the pin stem joint is designatedgenerally 28, the body portion being designated 29 and consisting of asimilar spherical surface 31 with a slot 30 therein. This slot providesa flat surface 31 in a plane intersecting the spherical surface. Theformation of the bearing for the pin stem pivot is shown in dotted linesat 32. There will also be the flange 33 similar to that heretoforementioned and the anchor portion 34. In this case the recess which willalso be cylindrical is designated 35 but is of a lesser depth than therecess 14. It, however, will be cyliiidiical.

A positioning device is shown in perspective in Fig. 7 and designatedgenerally 36 and comprises an arcnate portiori 37 which is' generallycylindrical with a wall portion e irtiiding radially inwardly from oneof its ends and designated 38 The size of this cylindrical grip is suchthat it may be compressed slightly to be inserted in the recess 35 andwhen released will expand to grip the walls of this recess and maintainitself in fixed position. The wall 38" is of a size and is of suchposition as to extend throiigh the slot 30' and engage one of the planesurfaces which will intersect this spherical outer surface of the bodyand will by reason of stich engagement hold the joiiit in a definiteposition relative to the recess. The height or length of this wall maybe such as to engage the bottom 33 of the s'lbt 30 and limit theinsertion of the joint into'the recess.

It will appear from the above that by the use of the spring grip devicewhich I have provided and each of which has a wall portion, the findingmay be located in position in the recess which receives it so that whenthe article is cast about the anchor portion of the finding, it

4. will be known that the slots and operating devices are properlyaligned for correct functioning in the pin stem.

I claim:

In combination, a mold having a cylindrical insert receiving holetherein and a positioning device for a pin stem finding having a fiatsurface comprising an .arcuate spring clip resiliently engaging thecylindrical wall of said hole, and a flat Wall extending from saidarcuate portion in a position to engage a plane surface of a pin stemfinding to hold the same in set position in said hole.

References Cited in the file of this patent UNITED STATES PATENTS1,465,116 Dewire Aug. 14, 1923 1,731,445 Thomann Oct. 15, 1929 2,082,604Upton June 1, 1937 2,332,856 Kalajian Oct. 26, 1943 OTHER REFERENCESPages 128 and 129 Die Casting for Engineers, The New Jersey ZincCompany, 160 Front Street, New York, New York, 1942.

